Diaphragm.



H. c. MALLORY.

- DIAPHRAGM. I APPLICATION FILED 0014,1911. RENEWED NOV. 11, 1913. I I 1,099,855. Patented June 9,1914,

2 SHEETSSHEET 1.

H. 0. MA LLORY. DIAPHRAGM. APPLIUATION FILED OGT,4, 1911. RENEWED NOV. 11,1913. 1,099,855, Patented June 9,1914

2 SHEETS-SHEET 2.

orrron HAIRBY C. 'lVLllLLURY, O1? BLELILFGET, NEW YORK.

IllZAEHRAG-El.

recesses.

Specification. of'lvetters Potent.

"Patented June 9, 1914..

Application filer Detobe'r l, loll, Serial No. 652,740. Renee/cc November 1.1, 1913. Serial No. 800,405.

To all whom it may concern Be it known that I, HARRY C, hlnnmnr, New York, have invented a new and useful Improvement in fully set of Bellport, Suffolk county,

5 Diaphragms, which invention is forth in the following specification.

diephragn'is adopted to pressure, as in steam traps, n tors,

single mg collapsible folds endgiving extensive movement While avoiding buckling and 5 other defects heretofore met with. in fist diephregrns.

Regulators of the dienhregm type, as dis tinguished from those of the bellows or cc cordion type, have been in eoimnon use for e. their surfaces have been with a view of. incrensbut these corrugations have not been given the proper design end character to produce elasticity enough to secure any wide range of movement, end to In flat dinphregms as heretofore constructed with con 7 the binding of the diaphragm when subjected to fluid pressure takes place so in a predominating measure at the annular flatten under this pressure. No great amount of flattening of these bends, and consequent motion of'the diewithout giving a permanent set to the diaphragm, which unfits it for usefulness in many situations. Diaphragms which. rely largely for outward motion on the capacity of the bends for fis toning are found to buckle around the point so of attachment of the power-transmitting This means lost niotion when tluid pressure is acting to force the diaphragm other power-transmeans does not therefore receive the it otherwise should no long time, and

given corrugations 111g their flexibility,

avoid buckling and lost motion.

rugations,

bends which 'phragm, can take place means.

out. The valve stem or mitting 4.5 extent of movement have, if there were no buckling.

It is the object of this invention to overobjections above described, and to has a wide range 01 motion more nearly approaching that of corrugated collapsible end expansiblc cylinder or bellows, and which is practically free from objections found in the use heretofore concomc, in large part or entirely, the of the character to provide a. diaphragm which 5 5 of flat diaphragms as flwruotecl;

l have discovered that by constructing the d aphragm with corrugations such that the bonding is transferred from the curved ridges of the corrugations to the flat or slightly curved marked. increase in the motion, power and life of the diaphragm is secured, While avoiding lost motion by buckling. I socoin olish this result by making the portions connecting the bends or ridges of the con volutions of sufiicient extent to "constitute the entire or substantially entire bending part of the diopl'zragin. While I may make all ports of the corrugations of the same density of metal, I prefer to stifi'en the bends, as by providing a greater hardness or compectness of metal along these points. The portions of the convolutions uniting the bends oreless dense, and are more flexible,

not be parallel with each other, and may normal to or inclined. to the face of the diapliregm.

'lhe li'iventive idea may receive a variety out mechanics-l expressions, some of which ere illustrated in the accompanying draw- 111,9;3, which are intended as assisting in the description and for illustration only, referones being bad to the claims for defining the limits of the invention.

in the drawings, Figure 1 is a View, portly in vertical section and partly in elevation, showing a damper regulator provided with my improvement; Fig. 2 is a top 1; Fig. is enenlarged detail of the dianhrsgni; and Figs. i and 5 are vertical sect1onsl views oi thcrniosensitive vessels proprominent.

In Figs. 1, 2 and 3, I have illustrated my such as operating dampers. The diaphragm l is made of sheet metal, suoh'lias siect iron, brass or bronze, which ossesses strength and flexibility, and is provided with a plurality of concentric folds or convolutions in which the troughs 2, 2, of one 3,3, o}? the ediacent folds by annular nor tions l, 4., of such depth that movement of the diaphragm out position takes place by vided with different embodiments of my imset of folds are connected with the crests connecting portions, 2,

and lorm annular rings, which may or may "plan view, taken below the line 22 of Fig.

of or into its normal flat 7' virtue of the ,col, o

lepsible and extensible notion in'ithe conmeeting portions more than in the bonds 2', 3.

As shown in cross-section, the connecting portions are notquite parallel, and the metal is not uniformly distributed. The bends are stiiiened by hardening or compacting the metal therein, as indicated by heavy shading between lines 5, 6, in the magnified detail view, F ig. '3, while the connecting portions are softer and more flexible. The

diaphragm 1 is provided with a flange 7,

which permits it to-be clamped between the rim of a diaphragm-casing 8. and a ring 9 by screws or bolts 10. The central-portion of the, diaphragm receives a'push rodor stud 11 for transmitting its-movement to a balanced damper lever 12, adjustably supn ported on a rocker 13 which;. sits on a spider frame 14 rising from ring 9. The movethe diaphragm chamber in communication ment of the lever opens and closes a furnace door or damper. 15 which is connected there to by a chain in the usual manner. With with the steam space of the boiler, for ex- V ample, the diaphragm will follow the fluctuations in the pressure, but for a given pressure on the underside of this collapsible (liaphragm, the movement of the central part of the diaphragm will be materially larger than in the case of a diaphragm in which the bends of the folds are relied on for giving flexibility. The reason for this will clearly appear in the description of the form of diaphrag'm having plain parallel tion by substantially their own movement.

The density of the sheet may be the same throughout, or it may be increasedat the bends, as above described. Assume the vesse contains an expansible fluid, and that its pressure has increased above the pressure when the diaphragm is in normal position with its side folds parallel. Besides the force exerted by the fluid pressure tending to force the diaphragm outward, there is a force set up against the annular walls) of I each fold, as indicated by arrows 17, 18.

These pressures are opposite, but are not equal since the area of the wall more remote from the center is greater than that nearer the center. There is therefore a resultant pressure on each fold acting in toward the center of the diaphragm. As soon as the diaphragm begins to yield outward under the initial action of the pressure -in direction along the normal axis of the diaphragm, then there is a normal component of this centrally directed pressure which is connectingkept within theelasi'fi limits of the metal in the diaphragm. It is also to be observed that inward buckling under the resistance oflered by the work through the rod or stem 0 attached to the diaphragm is guarded against, and lost motion practically obviated by the more advantageous posit-ion of the folds to resist thi tendency.

Instead of providing the folds with parallel sides normal to the surface, they may be parallel but inclined, as shown in Fig. 5; otherwise the construction is the same and also the mode of operation, as described with reference to Fig. 4.

What is claimed is 1. A diaphragm for use with fluid pressure, consisting of a sheet of metal provided with a plurality of annular convolutions, the bends of which are connectedby flexible annular portions in which motion is substantially confined when the diaphragm is sub yected to fluid pressure to bend it out "of its normal plane.

A collapsible diaphragm for use With fluid pressure, consisting of a sheet of metal provided with a plurality of annular convolutions, the bends of which are stiff and are connected by flexible annular portions in which motion is substantially confined when the diaphragm is subjected to fluid pressure to bend it out of its normal plane.

3. A collapsible diaphragm for use with fluid pressure, consisting of a sheet of metal provided with a plurality of annular convolutions, the bends of which are ofcompacted metal and are connected by flexible annular portions in which motion is substantially confined when the diaphragm is subjected to fluid pressure to bend it out of its normal plane. l

4-. A diaphragm for use with fluid pressure, consisting of a sheet of metal provided with a plurality of annular convolutions, the bends of which are connected by parallel flexible annular portions in which motion is substantially confined when thediaphragm is subjected to fluid pressure to bend it out of its normal plane.

5. A diaphragm for use with fluid pressure, consisting of-a sheet of metal provided with a plurality of annular convolutions, the bends of which are connected by parallel flexible annular portions inclined to the face of the diaphragm and in which of which are flexible and other portions more or less inflexible. I

7. A fiat diaphragm subject to fluctuations of fluid pressure, the same consisting of a sheet of metal provided with a plurality of concentric convolutions consisting of op positely disposed trough portions connected by concentric ring portions which latter are adapted to receive, and resolve lateral fluid pressure thereon into an outward thrust on 15 thediaphragnt increasing as the diaphragm expands away from its normal positlon.

In testlmony whereof I have si ned this specification in presence of two suscribing witnesses. HARRY C. MALLORY. Witnesses:

RALPH L. SCOTT, W. H. HARTING. 

